I have some questions and I hope you guys can help me answer them once and for all. I've seen the wheel and tire fitment thread but it appears that is mainly focused on the aftermarket wheel/tire crowd. My question concerns changing from one OEM tire size to another.

This past weekend we had quite the snow storm here in Georgia and it was not very fun being stuck in the snow while others passed me quite easily. Therefore I decided that not only should I get rid of these crappy Dunlops but that I should consider going to the wider OEM tire size but I'm not positive of the changes required.

2nd - I've seen that some have said the speedometer will read "correctly" with 265/70-R16 tires compared to 245/75-R16 tires. Is this true?

3rd - I've seen in the rear spring TSB that wheel alignment specs are called out and many of them differ between the Prerunner SR5 with 245/75-R16 and the TRD Offroad with 265/70-R16. Do the differences come from the tire size or from the suspension difference? If I change from 245 to 265 wide tires should I give my tire guy a copy of the TSB and tell them to use the TRD Offroad specs?

I had the rear TSB done too... but still had the 245's when that was completed... but I don't notice an issue with my setup now after changing tires.

I only mentioned this because in the TSB document itself it has different camber, toe, etc specs for the SR5 with 245 and the TRD with 265. My question is a. Are the different specs a result of the tire size or the suspension difference? and b. Are the differences large enough to be concerned with?

I consistently achieved 23 MPG last summer while I had the 245's (90% highway). I changed from stock steelies and 245's to TRD Trail Teams alloys and 265's in November I think... and noticed about a 2 MPG drop to 21 MPG... but I am still not convinced this is accurate. I think there may be a combination of factors involved that make my particular data incorrect...

I consistently achieved 23 MPG last summer while I had the 245's (90% highway). I changed from stock steelies and 245's to TRD Trail Teams alloys and 265's in November I think... and noticed about a 2 MPG drop to 21 MPG... but I am still not convinced this is accurate. I think there may be a combination of factors involved that make my particular data incorrect...

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